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Duplex filters in modern base stations are designed as cavity filters, which are expensive and have big dimensions. Thanks to the emerging digital technology and fast digital converters, it is possible to transfer the efforts of designing analog duplex filters into digital numeric algorithms applied to feedback structures, operating on power amplifiers in transmitters. The design of a digital baseband...
This paper presents our recently development of a compact nuclear magnetic resonance (NMR) system, including radiofrequency (RF) acquisition system and the coil design. For the acquisition system, a time-saving and cost-effective method is introduced for the development. In this system, circuit components are simplified by using the high-performance FPGA. This reduces the complexity and improves the...
CubeSat is a class of popular pico-satellites that is limited in size to a standard 10×10×10cm unit. In this paper, we present a functioning High Data Rate (HDR) 2.4 GHz radio for use on a CubeSat. Current CubeSats suffer from low data rate radios and this severely limits their functionality. In this design, the operating constraints of a CubeSat have been addressed. Namely, power, wide variations...
This paper presents the design of a reconfigurable Digital Down Converter (DDC) for a quad standard GNSS receiver. By considering GPS, GALILEO, GLONASS and BEIDOU standard specifications, a bandpass RF sampling-based GNSS receiver is designed. After direct digitization of input signals by choosing properly the sampling frequency, an eight-path reconfigurable DDC is proposed before Digital Signal Processing...
In recent years, we have experienced an impressive spread of mobile communications as well as the emergence of new communication protocols. This lead to an overutilization of some spectrum bands, while the utilization of other bands is sometimes minimal or insignificant. The exploration of the white spaces concept, which represents the unused portions of the spectrum, mainly due to the shutdown of...
In this paper a multi-platform HDL description of a circuit that implements all the digital processing and RF carrier generation for the class S Power Amplifier proposed by the Institute of Microelectronics and Wireless Systems is presented. The circuit is the combination of a lowpass sigma-delta modulation stage in series with a frequency shifting stage that generates the bitstream that drives a...
In this research work we present a reconfigurable platform that implements all the digital processing and RF carrier generation for the class S power amplifier proposed by the Institute of Microelectronics and Wireless Systems. This amplifier is a combination of a lowpass or bandpass sigma-delta modulation stage in series with a frequency shifting stage and a switch mode amplifier followed by a band...
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